PLM-ADIN problem

Hello!

I have a problem with the PLM-ADIN extension card I bought.
I have a ProfiLux 3 eX and the firmware is 5.11.

What I wanted to do is connect an irradiance sensor (W/m2) for a photobioreactor.
The sensor has an analogical exit of 0-10 V.

So, I installed the PLM-ADIN and I connected the sensor exit to the D-subminiature (DE-9) in the pins 6 (Analog input 1) and 8 (GND).

The PLN-ADIN is found in the Profilux and give me the two Voltage values. But the values are always zero.
The sensor works I tested with a Voltmeter and the volt increase following the warm or the light.

Any clues?
Tank you very much in advance!

You can test if the card is working by connecting Pin #1 to pin #6 - you should get the 10V.
If you insert a resistor in the wire, the value should decrease (20 kOhm ~5V; 1 MOhm ~0,2V ....)

Maybe the possible load of your signal is too low for the ADIN card. You can test that by connecting a 20 kOhm resistor between the GND and the 0-10V output of your sensor (aka create a short-circuit with a 20 kOhm resistor). If the voltage between the connections drop down, the signal load is too low for the ADIN card

I tried to connect the pins 1 and 6 and the measured voltage was 10 V.
I also inserted a resistor of 270 Ohm (the only I have) in the wire and the voltage decreased to 9,94 V.

I haven't understand exactly what do you mean with the second paragraph:
what is the difference between the first circuit with the resistor to test if the card is working?

Something like this? (R= 270 Ohm)
Attachment 3536 Voltage 1 = 9,94 V
Attachment 3537 Voltage 1 = 10,00 V
Attachment 3538 Voltage 1 = 7,30 V

Anyhow, if the problem would be the low load of signal, can this be solved in some way?

Thank you very much!

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I tried to connect the pins 1 and 6 and the measured voltage was 10 V.
I also inserted a resistor in the wire and the voltage decreased.

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So the ADIN card itself is working properly

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I haven't understand exactly what do you mean with the second paragraph

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Maybe a little sketch will make it more clear:Attachment 3541

Measure the sensor voltage without the ADIN card (the 20 kOhm resistor simulates the internal resistance of the ADIN). If the voltage drops down with resistor, the sensor can´t be used with the ADIN the card directly.

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if the problem would be the low load of signal, can this be solved in some way?

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That´s not so easy. You need some kind of isolation amplifier with 1:1 rate

Ok I did what you told me without the ADIN card but actually it was always 0,0 V with or without the resistor.
So I measured the output of the sensor with the voltmeter and it was 0,0 V. I thought that probably the light of the office wasn't so good for the sensor and I placed on the sunlight and the volts were 2,7. I connect everything again and now works! Sorry for the inconvenience :(